diff --git a/package.json b/package.json
index 275eae9..8651be3 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "grunt-known-options": "~2.0.0",
     "interpret": "~1.1.0",
     "liftup": "~3.0.1",
-    "nopt": "~4.0.1",
+    "nopt": "~5.0.0",
     "v8flags": "^4.0.1"
   },
   "devDependencies": {